blob: c5abb724161a5015e1abe49546b173535f3fd1cb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
type Box, C;
function box<a>(a) returns (Box);
function unbox<a>(Box) returns (a);
axiom (forall<a> x:a :: unbox(box(x)) == x);
axiom (forall<a> x:Box :: {unbox(x):a} box(unbox(x):a) == x);
axiom (forall x:Box :: box(unbox(x)) == x); // warning
procedure P() {
var b : Box;
var i : C;
assert unbox(box(13)) == 13;
i := unbox(b);
assert b == box(i);
assert false;
}
|